# Relationship history for MSHA mine 2402045

Current hierarchy: **George R  Thompson → Thompson Excavating → OPEN BUCKLE PIT**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** George R  Thompson → OPEN BUCKLE PIT; 1987-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Thompson Excavating → OPEN BUCKLE PIT; 1994-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** George R  Thompson → Thompson Excavating; 1994-04-01 to current/open; source msha-controller-operator-history